Having two distinct surfaces (e.g., leaves with differentiated upper/lower sides).

Arranged in two opposite rows or ranks, especially leaves on a stem.

Deeply divided into two parts; forked or split halfway down.

Having two leaves (as in some palm species).

Having two leaflets (compound leaves with exactly two leaflets).

Having or producing two follicles (seed pods that split along one side).

Having two openings or pores (e.g., in pollen grains or stomata).

Divided into two branches or forks; Y-shaped.

Doubly paired; having structures arranged in two pairs.

Two-lipped (typically describing corollas with distinct upper and lower lips).